Agent Skills: rust

Rust engineering standards and deep references — ownership/borrowing-driven design, error handling (thiserror/anyhow), async with tokio, axum services, testing, and clippy/cargo-deny discipline. Load whenever writing, editing, or reviewing Rust: any .rs file, Cargo.toml/Cargo.lock change, cargo or clippy failure, or Rust design/test planning — with or without a role agent (/be, /rev) invoked. NOT for merely running or installing a compiled Rust tool.